LTC2450 APPLICATIONS INFORMATIONSerial Clock Idle-High (CPOL = 1) Examples the falling edge of the serial clock (SCK). A 17th clock pulse is used to trigger a new conversion cycle. In Figure 5, following a conversion cycle the LTC2450 automatically enters the low power sleep mode. The user Serial Clock Idle-Low (CPOL = 0) Examples can monitor the conversion status at convenient intervals using CS and SDO. In Figure 7, following a conversion cycle the LTC2450 CS automatically enters the low power sleep state. The user is pulled low to test whether or not the chip is in determines data availability (and the end of conversion) the CONVERT state. While in the CONVERT state, SDO based upon external timing. The user then pulls CS low is HIGH while CS is LOW. In the SLEEP state, SDO is (CS = ↓) and uses 16 clock cycles to transfer the result. LOW while CS is LOW. These tests are not required op- Following the 16th rising edge of the clock, CS is pulled high erational steps but may be useful for some applications. (CS = ↑), which triggers a new conversion. When the data is available, the user applies 16 clock cycles The timing diagram in Figure 8 is identical to that of Figure 7, to transfer the result. The CS rising edge is then used to except in this case a new conversion is triggered by SCK. initiate a new conversion. The 16th SCK falling edge triggers a new conversion cycle The operation example of Figure 6 is identical to that of and the CS signal is subsequently pulled high. Figure 5, except the new conversion cycle is triggered by CS SD0 D15 D14 D13 D12 D2 D1 D0 SCK clk1 clk2 clk3 clk4 clk15 clk16 CONVERT SLEEP DATA OUTPUT CONVERT LOW I 2450 F05 CC Figure 5. Idle-High (CPOL = 1) Serial Clock Operation Example. The Rising Edge of CS Starts a New Conversion CS SD0 D15 D14 D13 D12 D2 D1 D0 SCK clk1 clk2 clk3 clk4 clk15 clk16 clk17 CONVERT SLEEP DATA OUTPUT CONVERT LOW I 2450 F06 CC Figure 6. Idle-High (CPOL = 1) Clock Operation Example. A 17th Clock Pulse is Used to Trigger a New Conversion Cycle 2450fb 10
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